Russel Kappius' detailed but very UNDERSTANDABLE description of why his hub is better can be found right
HERE, on the Terra Forma Sports Website.
ImprovementsThe solution to the problem hit Kappius a few years ago when SRAM introduced its “hollow” cassette designs. Kappius said to himself, “that should be hub under there, not an air pocket!” From this eureka moment, Kappius came up with his design philosophy: “The number one priority of my hub design is to make it more reliable. Second is simpler, followed by lighter.”
Wider: Because Kappius is filling that void with hub, the bearings in the Evolution hub are much more widely spaced. This strengthens the entire structure of the wheel and is less tasking on the bearings themselves. In fact the oversized bearings in the Evolution hub are spaced 50 percent wider than in most current production offerings
Bigger: Everything is oversized on the Terra Forma Evolution hub. Kappius upped the size of not only on his hub’s bearings but also the size of the drive mechanism. Bigger bearings are stronger, easier to seal and last longer.
Kappius improved transmission reliability by making the engagement interface twice the diameter of standard cassette bodies. When you take apart the hub and inspect the pawls, springs and bearings and compare it to a normal hub, you see how bigger really can be better.
Faster: Kappius also saw that he could achieve all his reliability goals while making engagement quicker. A few companies like Industry Nine have started to realize the advantage of a super fast engagement. Currently the Terra Forma Evolution hub has 180-point engagement (Industry Nine has 120 point engagement).
I really noticed the quick engagement over technical terrain where I could pedal several half revolutions to keep my pedals from hitting rocks.
Lighter: Without the funding of a big R&D department Kappius already has his hub weights at 115 grams and 260 grams for front and rear 9 mm quick release hubs. A front 15mm thru-axle is 120 grams and a Lefty front is 110 grams.